Patents by Inventor C. William Haack

C. William Haack has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Air duct and method of making same
    Patent number: 5918644
    Abstract: An air conveying duct has a foam core sealed on the inside and reinforced on the outside. The duct absorbs noise and neither introduces impurities into the air nor collects impurities from the air.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: July 6, 1999
    Inventors: C. William Haack, Michael T. Nixon